Zeplo.io - Message queue as service.
Qminder - Qminder works the way it sounds: It helps a company mind its queues.
Zenlist - Google ads for classifieds
FlexQ - Beyond a queue management system, Flexq is a unique solution that helps you reinvent the customer journey.
Waitwize - The Future of Queue Management and Order Notification
Bubo - Your personal task management assistant